Search Results 1-20 of 2884

  • Fade of transpolar arc and its relation to the intensification of the nightside auroral oval  [in Japanese]

    小原 隆博 , OBARA Takahiro

    第17回宇宙環境シンポジウム (2020年10月7日-8日. 宇宙航空研究開発機構(JAXA)オンライン会議)北向き太陽風磁場の状態(IMF Bz>0)で、太陽風磁場の水平成分(IMF By)の極性が変わるとき、極冠域にトランスポーラ―アークと呼ばれるオーロラが出現する。このような状態で、太陽風磁場が南転した時、トランスポーラ―アークは消失を始め、しばらくすると、夜側オーロラオーバルが増光し …

    宇宙航空研究開発機構特別資料: 第17回「宇宙環境シンポジウム」講演論文集 = JAXA Special Publication: Proceedings of the 17th Spacecraft Environment Symposium (JAXA-SP-20-007), 7-12, 2021-01-29

    IR  DOI 

  • VUV Emission Spectroscopy for Evaluation of Optical Thickness in He Cascade Arc Plasmas

    ISLAM Md. Anwarul , SHIGESADA Ryo , YAMAGUCHI Takumi , KAWAZOME Hayato , TAMURA Naoki , OKUNO Hiroki , NAMBA Shinichi

    … Lyman α intensity was increased by 3 times with a magnetic field due to well confinement of He plasma. … The intensity decreased rapidly at high-ambient pressures due to the strong self-absorption. …

    Plasma and Fusion Research 16(0), 2406011-2406011, 2021


  • Composition Dependence of Normal Spectral Emissivity of Liquid Ni–Al Alloys

    Adachi Masayoshi , Yamagata Yuji , Watanabe Manabu , Hamaya Sonoko , Ohtsuka Makoto , Fukuyama Hiroyuki

    … In this study, the normal spectral emissivity of Ni–Al liquid alloys was measured using the electromagnetic levitation technique under a static magnetic field. … The short range chemical ordering could be attributed to strong bonding between Ni and Al atoms, which affected the scattering cross section of the conduction electrons even in the liquid state; …

    ISIJ International 61(3), 684-689, 2021


  • Acceleration of Magnetized Plasmoid by Pulsed Magnetic Coil

    SEKI Taichi , ASAI Tomohiko , KOBAYASHI Daichi , YANAGI Ryotaro , GOTA Hiroshi , ROCHE Thomas , MATSUMOTO Tadafumi

    … An accelerated plasmoid penetrates through confinement magnetic fields and reaches the core region of target plasmas. … To inject plasmoids into the magnetically confined plasmas featuring strong confinement fields, the injection velocity should be increased. … Pulsed magnetic coil has been introduced for the additional acceleration of the ejected plasmoid. …

    Plasma and Fusion Research 16(0), 2401020-2401020, 2021


  • Broadband cross dipole antenna for UHF near-field RFID applications

    Yu Zhengyong , Huang Cheng , Xu Yihan , Jiang Yan

    … <p>A broadband cross dipole antenna for ultra-high frequency (UHF) near-field radio frequency identification (RFID) applications is proposed in this paper. … Meanwhile, a strong and uniform magnetic-field distribution surrounding the antenna is achieved with an interrogation zone of 142mm×142mm.</p> …

    IEICE Electronics Express 18(2), 20200398-20200398, 2021


  • Influence of Partial Electrical Conducting Wall on Electrodynamic Flow Control

    NAGATA Yasunori , YAMANE Eisuke , NORII Takumi , KOUCHI Toshinori , YANASE Shinichiro

    … <p>The electrodynamic flow control effect using an applied magnetic field has a potential of innovative technology for aerodynamic force control of atmospheric entry vehicle because of no requirement of mechanical devices. … If the induced electric current is bypassed via exposed electrodes, the electromagnetic field could be changed. … As a result of the MHD simulation, flow field could be changed by the vehicle surface condition. …



  • Anomalous Electron Transport in Hall Thrusters: Electric Field Fluctuation Measurement

    KUWABARA Naoya , CHONO Masatoshi , MORITA Taichi , YAMAMOTO Naoji

    … Numerous studies have shown that high-frequency (on the order of MHz) fluctuations in both the electric field and plasma density are one of the causes of the anomalous transport. … Here we focus on electric field fluctuations in the azimuthal direction inside a Hall thruster, and measure floating potential difference between two Langmuir probes. …



  • Aggregation vs Surface Segregation: Antagonism over the Magnetic Behavior of NiCr Nanoparticles

    Murtaza Bohra , Vidya Alman , Arun Showry , Vidyadhar Singh , Rosa E. Diaz , Mukhles Sowwan , Panagiotis Grammatikopoulos

    … Annealing is a valuable method for fine-tuning the ultrasmall magnetic properties of alloy nanoparticles (NPs) by controlling their sizes, modifying their surfaces, and affecting their magnetic interactions. … Concurrent temperature-dependent electron microscopy and magnetization data demonstrate the interplay of two competing factors, namely, enhanced particle aggregation and element-specific surface segregation, on the magnetic properties, with the former boosting and the latter suppressing them. …

    ACS Omega 5(51), 32883-32889, 2020-12-14


  • Quantum oscillations with magnetic hysteresis observed in CeTe3 thin films

    Mori Watanabe , Sanghyun Lee , Takuya Asano , Takashi Ibe , Masashi Tokuda , Hiroki Taniguchi , Daichi Ueta , Yoshinori Okada , Kensuke Kobayashi , Yasuhiro Niimi

    … It is known that CeTe3 has two magnetic transitions at TN 1 approximate to 3K and TN 2 approximate to 1K. … A clear Shubnikov-de-Haas (SdH) oscillation was observed at 4K, demonstrating the strong two-dimensional nature in this material. … BelowTN 2, the SdH oscillation has two frequencies, indicating that the Fermi surface could be slightly modulated due to the second magnetic transition. … We also observed a magnetic hysteresis in the SdH oscillation below TN 1. …

    Applied Physics Letters 117(7), 072403, 2020-08-19


  • Dynamical Time-Reversal and Inversion Symmetry Breaking, Dimensional Crossover, and Chiral Anomaly in α-(BEDT-TTF)₂I₃  [in Japanese]

    Morinari Takao

    … We demonstrate that these symmetries are broken in Dirac fermions in the organic conductor α-(BEDT-TTF)₂I₃ due to the bond correlation created by the strong inter-site electronic correlation. … A chiral anomaly is predicted to be observed in the magnetoresistance when the magnetic field is tuned to the inter-layer tunneling direction. …

    Journal of the Physical Society of Japan 89(7), 2020-07-15


  • Severe Magnetic Fluctuations in the Near‐Earth Magnetotail: Spectral Analysis and Dependence on Solar Activity

    Xu Heqiucen , Shiokawa Kazuo

    Magnetic fluctuations in the near‐Earth magnetotail are an important signature of substorm onset. … We found 10,848 severe magnetic fluctuation events with σB∕ ̄B > … 0.5, where σBand ̄B are the standard deviation and average, respectively, of the magnetic field intensity for the local proton gyroperiod. … The occurrence rates of severe magnetic fluctuations show no clear dependence on the F10.7 index in one solar cycle. …

    Journal of Geophysical Research: Space Physics 125(7), e2020JA027834, 2020-07


  • The Quasipersistent Feature of Highly Structured Field‐Aligned Currents in the Duskside Auroral Oval: Conjugate Observation Via Swarm Satellites and a Ground All‐Sky Imager  [in Japanese]

    Yokoyama Y. , Taguchi S. , Iyemori T. , Hosokawa K.

    … During northward interplanetary magnetic field (IMF), irregular magnetic perturbations were observed in the duskside aurora oval via Swarm satellites instead of large‐scale Region 1/2 magnetic perturbations. … By taking advantage of Swarm constellation measurements, and their conjugate observations with an all‐sky imager on the ground, the features of the irregular magnetic perturbations were examined. …

    Journal of Geophysical Research: Space Physics 125(7), 2020-07


  • Open Quantum Dynamics Theory of Spin Relaxation: Application to μSR and Low-Field NMR Spectroscopies

    Takahashi Hideaki , Tanimura Yoshitaka

    … We present a quantum mechanically rigorous theory in order to help the analysis of spectra obtained from the advanced nuclear magnetic resonance (NMR) and muon spin rotation, relaxation or resonance (μSR) techniques. … Our approach is based on the numerically "Exact" hierarchical equations of motion (HEOM) approach, which allows us to study the reduced system dynamics for non-perturbative and non-Markovian system-bath interactions at finite temperature even under strong time-dependent perturbations. …

    Journal of the Physical Society of Japan 89(6), 2020-06-15


  • Ultracold collisions in the Yb-Li mixture system

    Schäfer Florian , Konishi Hideki , Bouscal Adrien , Yagami Tomoya , Frye D. Matthew , Hutson M. Jeremy , Takahashi Yoshiro

    … At low magnetic fields, by measuring inelastic interspecies collisional losses in the double quantum degenerate mixture we reveal the strong dependence of the inelastic losses on the internal spin states of both species and suppressed losses in stretched state configurations. … Increasing the magnetic field up to 800 G we further investigate the magnetic field dependence of the collisional interactions. …

    Journal of Physics: Conference Series(ICPEAC2019) 1412(2020), 2020-06-11


  • Generation of strong magnetic force field using permanent magnet and magnetic levitation of water(Outline of Master Thesis)--(Master Course of Environmental Symbiotic System Major)  [in Japanese]

    菅谷 将之

    … Therefore, developing a technology to levitate an object is very important, and one of the most promising candidates is magnetic levitation technique. … However, in fact, magnetic levitation is also difficult, and actually, we must use one of the most powerful magnets specially established in the institute for strong magnetic field research, which limits the users, usage time, and application scope. …

    日本工業大学研究報告 = Report of researches, Nippon Institute of Technology 50(1), 29-32, 2020-06



    鷹野 紗央里

    … In this study, I attempted to produce the crystal-oriented LSO ceramics by an electrophoretic deposition (EPD) in a strong magnetic field. … From X-ray diffraction analysis and electrical conductivity measurements, low degree of crystal-oriented layer was formed at the surface of the LSO ceramics produced by the EPD under a strong magnetic field. …

    法政大学大学院紀要. 理工学・工学研究科編 (61), 1-2, 2020-03-24

    IR  DOI 

  • Proximity coupling of superconducting nanograins with fractal distributions

    Uchino Takashi , Teramachi Nanami , Matsuzaki Ryosuke , Tsushima Emi , Fujii Shusuke , Seto Yusuke , Takahashi Kazuyuki , Mori Takao , Adachi Yutaka , Nagashima Yukihito , Sakaguchi Yoshifumi , Ohishi Kazuki , Koda Akihiro , Sakurai Takahiro , Ohta Hitoshi

    … We explore the electrical and magnetic properties of a fractal assembly of Josephson junctions with transparent interfaces. … Irrespective of the low volume fraction of MgB2 nanograins, the nanocomposite behaves as a bulk-like superconductor, i.e., zero resistivity, perfect diamagnetism, and strong vortex pinning. …

    Physical Review B 101(3), 035146, 2020-01-27


  • Orientation of Ligand Field for Dangling Manganese in Photosynthetic Oxygen-Evolving Complex of Photosystem II

    Mino Hiroyuki , Nagashima Hiroki

    … The spin structure in the S2 state and the crystal structure of the manganese cluster of the oxygen-evolving complex of plant photosystem II were combined by the quantitative evaluation of the magnetic anisotropy of the g = 4 signal. … By comparison with the crystal structure, the z-axis of the zero-field splitting was ascribed to the direction of the dangling Mn connecting water oxygen, Mn4–O(W1), in the manganese cluster. …

    The Journal of Physical Chemistry B 124(1), 128-133, 2020-01-09


  • Feedforward Anti-Sway Control Method for Crane Payload Constrained to Target Trajectory  [in Japanese]

    SUGAWARA Yoshiki , FURUTA Sotaro , TAKEDA Masakazu

    … The environment inside of and around the reactor is strong radiation, high vacuum, strong magnetic field and high temperature environment. …

    The Proceedings of the Dynamics & Design Conference 2020(0), 546, 2020


  • Actively controlled magneticlevitation of a ferrofluid droplet in mid-airusing a bar-shaped electromagnet

    YAMAGUCHI Soichiro , OHJI Takahisa , AMEI Kenji , KIYOTA Kyohei

    … Ferrofluid is a magnetic functional fluid that flows in the direction of strong magnetic field. … The authors tried non-contact levitation of a ferrofluid droplet in mid-air by controlling external magnetic field from a bar-shaped electromagnet. …

    Journal of the Japan Society of Applied Electromagnetics and Mechanics 28(3), 239-244, 2020


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